RF transmitter for efficiently compensating output power variation due to temperature and process
Inactive Publication Date: 2006-07-06
SAMSUNG ELECTRONICS CO LTD
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Benefits of technology
[0024] The VCO or the low pass filter may comprise a resonator using a transconductor as a resistance, wherein the performance characteristics of the transconductor vary with operating temperature fluctuations or manufacturing process variances.
[0025] In another embodiment, the invention provides an RF transmitter comprising; a digital-to-analog converter adapted to receive Inphase binary data and Quadrature binary data and further adapted to convert the Inphase binary data and Quadrature binary data to analog baseband signals using a reference current, a low pass filter comprising a transconductor having a resistance that varies in accordance with a tu
Problems solved by technology
That is, although high power amplifiers are manufactured according to a particular set of design specifications using defined manufacturing processes, non-uniform results may nonetheless be obtained due to uncontrolled deviations (or anomalous collective variations) in the processes used to fabricate the constituent semiconductor components of the high power amplifier, for example.
Decreased output power from the high power amplifier may degrade the communications link performance otherwise enabled by the RF transmitter.
On the other hand, increased output power from the high power amplifier may cause interference with nearby devices.
However, since the automatic level control loop directly controls the high power amplifier output power, and since the output power comprises RF band energy, a large amount of power may be consumed in the compensation process over the entire range of output power variations expected in many conventional power amplifiers.
Therefore, the conventional RF transmitter consumes a large amount of power during the compensation process which is dependent upon modifications to the bias current supplied to the power amplifier.
Method used
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[0036] Reference will now be made in some additional detail to several exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. However, the scope of the invention is not limited to the illustrated embodiments, but is defined by the claims that follow.
[0037]FIG. 3 is a block diagram illustrating an RF transmitter according to one embodiment of the invention.
[0038] Referring to FIG. 3, the exemplary RF transmitter generally comprises: a digital-to-analog converting unit 310; a low-pass filtering unit 320 comprising a transconductor enabled temperature compensation capability; a mixing unit 330 having front end transconductor 331; a multiplexer 340; a power amplifier 350; an automatic level controller 360; a reference current generator 370; an auto tuner 380 and a local oscillator 390.
[0039] Collectively, at least in one embodiment of the invention, digital-to-analog converting unit 310; low-pass filtering unit 320; mixing unit 330; an...
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An RF transmitter includes a modulating circuit adapted to modulating an RF signal, an output amplifier adapted to amplify the modulated RF signal; an auto tuner generating a tuning voltage that varies in accordance with operating temperature fluctuations and / or manufacturing process variances, and a reference current generating circuit adapted to generate a reference current in response to the tuning voltage.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] Embodiments of the present invention relate to a radio frequency (RF) transmitter. More particularly, embodiments of the invention relate to an RF transmitter adapted to effectively compensate for output power variations due to the temperature and a process without adversely impacting power consumption. [0003] This application claims priority to Korean Patent Application No. 2005-00564 filed Jan. 4, 2005, the subject matter of which is hereby incorporated by reference. [0004] 2. Description of the Related Art [0005] Generally, the RF transmitter of a wireless communication system uses a high power amplifier (HPA) to transmit RF signals through an antenna. However, the output characteristics of the high power amplifier typically change in accordance with variations in temperature. Such temperature variations may be due to changes in the ambient operating temperature for the system, or the development of heat from int...
Claims
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Login to View More IPC IPC(8): H04L25/49
CPCH03B5/24H03B2200/0058H03F1/30H04B2001/0416H04L27/368H04B1/04
InventorKIM, JAE-WANBAE, JONG-DAE
OwnerSAMSUNG ELECTRONICS CO LTD